Are you sure about the first rule? It doesn't seem necessary according to https://oeis.org/A014575.
The problem is really fun.
Since I created the problem series and want the Functions I badge, I thought I'd provide the solution that incorporates vampire_factor and are_fangs. Not a great score, but readable!
Sorry, I mean the Magic Numbers badge.
Tic Tac Toe FTW
Reverse the Words (not letters) of a String
Project Euler: Problem 1, Multiples of 3 and 5
Find nearest prime number less than input number
Multivariate polynomials - overload multiplication
Multivariate polynomials - emulate symbolic form
Fangs of a vampire number
Multivariate polynomials - convert monomial form to array
Outer product of multiple vectors
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